HeartSaVioR commented on a change in pull request #30789:
URL: https://github.com/apache/spark/pull/30789#discussion_r544698190
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File path: docs/structured-streaming-programming-guide.md
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@@ -1689,6 +1689,25 @@ hence the number is not same as the number of original
input rows. You'd like to
There's a known workaround: split your streaming query into multiple queries
per stateful operator, and ensure
end-to-end exactly once per query. Ensuring end-to-end exactly once for the
last query is optional.
+### State Store and task locality
+
+The stateful operations store states for events in state stores of executors.
State stores occupy resources such as memory and disk space to store the states.
+So it is more efficient to keep a state store provider running in the same
executor across different streaming batches.
Review comment:
`batches` would also just work - looks like in further sentences you
seem to use `batches` simply.
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